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mbedtls_mpi_gcd: small optimization

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Shifting TA and TB before the loop is not necessary. If A != 0, it will be
done at the start of the loop iteration. If A == 0, then lz==0 and G is
correctly set to B after 0 loop iterations.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-06-09 13:27:05 +02:00
parent b5e56ec5fd
commit c86acc5434
1 changed files with 0 additions and 3 deletions
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3
library/bignum.c
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@ -2404,9 +2404,6 @@ int mbedtls_mpi_gcd( mbedtls_mpi *G, const mbedtls_mpi *A, const mbedtls_mpi *B
if( lzt < lz ) if( lzt < lz )
lz = lzt; lz = lzt;
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &TA, lz ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &TB, lz ) );
TA.s = TB.s = 1; TA.s = TB.s = 1;
while( mbedtls_mpi_cmp_int( &TA, 0 ) != 0 ) while( mbedtls_mpi_cmp_int( &TA, 0 ) != 0 )